Transcription of National Standard Taper Pipe (NPT) Threads Size …
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National Standard Taper pipe (NPT) Threads size Chart 1 2 3 3 3 3 3 3 makeup turnsLength of effective threadNominal size (inside diameter)Length of engagement (tightened by hand)Actual ODThreads per inchHand tight turns
National Standard Taper Pipe (NPT) Threads Size Chart 1/16 0.3125 27 0.16 0.2611 1/8 0.405 27 0.18 4½ 2½ 0.26 1/4 0.54 18 0.2 4 3 0.401 3/8 0.675 18 0.24 4½ 3 0.408
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